22//완벽한 정답이 아닙니다.
33//정답 1 - codeisneverodd
44function solution ( clothes ) {
5- var answer = 1 ;
6- const spyWear = { }
7- for ( const clothNPart of clothes ) spyWear [ clothNPart [ 1 ] ] = ( spyWear [ clothNPart [ 1 ] ] || 0 ) + 1
8- for ( const part in spyWear ) answer *= ( spyWear [ part ] + 1 )
9- return answer - 1 ;
5+ var answer = 1 ;
6+ const spyWear = { } ;
7+ for ( const clothNPart of clothes )
8+ spyWear [ clothNPart [ 1 ] ] = ( spyWear [ clothNPart [ 1 ] ] || 0 ) + 1 ;
9+ for ( const part in spyWear ) answer *= spyWear [ part ] + 1 ;
10+ return answer - 1 ;
1011}
1112
1213//정답 2 - codeisneverodd
1314function solution ( clothes ) {
14- var answer = 0 ;
15- const spyWear = { }
16- for ( const clothNPart of clothes ) {
17- if ( spyWear [ clothNPart [ 1 ] ] === undefined ) spyWear [ clothNPart [ 1 ] ] = [ ]
18- spyWear [ clothNPart [ 1 ] ] . push ( clothNPart [ 0 ] )
19- }
20- const clothesCount = [ ]
21- for ( const part in spyWear ) clothesCount . push ( spyWear [ part ] . length + 1 )
22- answer = clothesCount . reduce ( ( previous , current ) => previous * current , 1 ) - 1
23- return answer ;
24- }
15+ var answer = 0 ;
16+ const spyWear = { } ;
17+ for ( const clothNPart of clothes ) {
18+ if ( spyWear [ clothNPart [ 1 ] ] === undefined ) spyWear [ clothNPart [ 1 ] ] = [ ] ;
19+ spyWear [ clothNPart [ 1 ] ] . push ( clothNPart [ 0 ] ) ;
20+ }
21+ const clothesCount = [ ] ;
22+ for ( const part in spyWear ) clothesCount . push ( spyWear [ part ] . length + 1 ) ;
23+ answer =
24+ clothesCount . reduce ( ( previous , current ) => previous * current , 1 ) - 1 ;
25+ return answer ;
26+ }
27+ // 정답 3 - hyosung
28+ function solution ( clothes ) {
29+ let answer = 1 ;
30+ // 옷 종류
31+ const types = { } ;
32+ // 반복문 최적화 - length, 비교연산 제거
33+ const length = clothes . length ;
34+ for ( let i = length ; i -- ; ) {
35+ // 해당 옷의 종류가 없다면 종류 1
36+ if ( ! types [ clothes [ i ] [ 1 ] ] ) types [ clothes [ i ] [ 1 ] ] = 1 ;
37+ // 해당 옷의 종류가 있다면 종류 증가
38+ else types [ clothes [ i ] [ 1 ] ] += 1 ;
39+ }
40+ // (종류 별 값 + 1 ) 을 다 곱셈
41+ Object . values ( types ) . forEach ( ( v ) => {
42+ answer *= v + 1 ;
43+ } ) ;
44+ 45+ return answer - 1 ;
46+ }
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